(上海大学土木工程系， 上海 200444)

［摘要］设计了3根锚焊U形钢板加固的混凝土梁试件，并进行了四点弯曲加载试验，获得试件的破坏形态、荷载挠度曲线、钢板和混凝土界面滑移情况以及各材料在加载过程中的应变发展情况，分析了加固梁的受力模式。采用有限元软件ABAQUS分析配筋率、抗剪螺栓间距、抗屈曲螺栓数量和钢板厚度对加固梁性能的影响特征和变化规律。试验结果表明，锚焊U形钢板加固混凝土梁的破坏模式属于延性的弯曲破坏，且整体性良好。有限元分析结果表明，配筋率越高的构件，加固效果越差；增加翼缘抗剪螺栓间距、梁底抗剪螺栓间距和腹板抗屈曲螺栓数量可以限制钢板的滑移和屈曲失稳，一定范围内能增加梁的极限承载力；加固钢板越厚，加固梁的刚度和承载力越大，并且钢板厚度的不同对梁的屈服变形和极限变形均有一定的影响。 

［关键词］锚焊U形钢板；加固；钢筋混凝土梁；四点弯曲试验；抗弯性能

中图分类号：TU317-1 文献标识码：A文章编号：1002-848X(2021)16-0086-07

Study on flexural behavior of reinforced concrete beams strengthened with anchor welded U-shaped steel plate 

QIAN  Wei,  YANG  Feng,  WANG  Peicheng,  ZHOU  Jian 

(Department of Civil Engineering, Shanghai University, Shanghai 200444， China) 

Abstract: Three concrete beams strengthened with anchor welded U-shaped steel plates were designed to carried out four-point bending loading tests. The failure mode, load-deflection curve, slip of steel plate and concrete interface and the strain development of each material during loading were obtained, and the stress mode of the strengthened beams were analyzed. The finite element software ABAQUS was adopted to analyze the influence characteristics and change laws of the reinforcement ratio, shear bolt spacing, increasing of and the thickness of steel plate on the performance of strengthened beams. The test results show that the failure mode of concrete beam strengthened with anchor welded U-shaped steel plate belongs to ductile bending failure mode, and its integrity is good. The results of finite element analysis show that the higher the reinforcement ratio, the worse the reinforcement effect; increasing shear bolt spacing of flange and beam bottom and increasing the number of buckling bolts of web can limit the slip and buckling instability of steel plate, and increase the ultimate bearing capacity of the beam within a certain range. The thicker the strengthened steel plate is, the greater the rigidity and bearing capacity of the strengthened beam are, and the different thickness of the steel plate has certain influence on the yield deformation and ultimate deformation of the beam. 

Keywords:anchor welded U-shaped  steel plate； reinforcement； reinforced concrete beam； four point bending test； flexural behavior

*上海市科学技术委员会技术标准专项基金（13DZ0501700）。

 作者简介：钱威，硕士，Email:18817284648@163.com； 通信作者： 杨锋，硕士，副教授，Email:fyang525@sina.com。